Dental crown-remover.



E. H. TAYLOR..

DENTAL CROWN REMOVER.

APPLIGATION FILED AUG. 6, 1913.

1,094,269, Patented Apr. 21, 1914.

W "ff 115 ff? j" 10' INVENTOH RICHARDSON H. TAYLOR, or MEKER, COLORADO.

DENTAL CROWN-REMOVER.

Specication of Letters Patent.

Application filed August 6, 1913.

Patented Apr. 251, 1914.

Serial No. 783,266.

To all whom t may concern Be it known that I, RICHARDSON H. TAY- LOR, a citizen of the United States, and a resident of Meeker, in the county of Bio Blanco and State of Colorado, have invented a new and Improved Dental Crown-Remover, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: to provide means for removing crowns or coverings from teeth by a careful and painless application of force, to lift the cap or covering from the tooth to which it was applied; to apply the force necessary for the removal of the cro-wn or covering, at a distance from the tooth, for the convenience of the dentist; and to provide a guide plate for the tool, having a peep-hole or observation opening to guide the placement of the tool.

One embodiment of t-he present invention is shown in the accompanying drawings, in which- Figure 1 is a longitudinal section taken on the line 1-1 in Fig. 2; Fig. 2 is a top plan view of an implement constructed and arranged in accordance with the present invention, the transmission stem being partly broken away to show the mount-ing of the spring for normally opening the jaws of the forceps; Fig. 8 is a cross section taken on the line 3 8 in Fig. 2; Fig. 4 is a detail view showing a fragment of the forceps and a guide plate for the screw-jack; Fig. 5 is a detail view, on an enlarged scale, showing an end fragment of forceps in operative position upon a tooth and crown or cover therefor, said crown or cover being shown in section.

As seen in the dra-wings, the forceps having hand-grips 10 and jaws 11, are of substantially conventional design and construction. The jaws 11 have serrations 12 extending crosswise said jaws and disposed lengthwise of the grips 10. The members constituting the forceps are pivotally connected by a pin 13, the shank whereof is bored and adapted to hold a screw 14. The screw 14 is provided to hold rigidly a. guide plate 15, the median port-ion 16 whereof is provided with an opening or passage 17, through which may be sighted the position of the reduced end 18 of a screw 19. The screw 19 is mounted in a tapped perforation formed in the reduced extension 20.

The screw 19, when mounted in the perforation formed in the extension 20, constitutes a jack to lift the jaws 11 and crown B when the reduced end 18 of the screw 19 rests upon the tooth root A, as seen best in Fig. 5 of the drawings. To permit thereduced end 18 to rest on the root A, the crown B is bored preliminarily to applying the remover herein described. It is to aid in placing the relatively minute end 18 of the screw 19 in the correspondingly minute perforation formed in the crown that I have provided the opening or passage 17.

When, in the operation, the screw 19 is adjusted, the end 18 thereof entering the hole in the crown B, the grips l0 are drawn together by the hand of the operator until the serrations 12 of the jaws 11 bite into or firmly grip the sides of the crown B. The grips and jaws connected therewith are held in the contracted position by a swinging metal loop 21. The loop 21 is mounted to rock on the bar 22. A small spring 23 bears against the upper end of the loop 21, to tilt the loo-p 21, as shown best in Fig. 8 of the drawings.. In this position, it will be noted that the loop 21 engages and clamps upon a bar 24. The bar 24 is slidably mounted on the bar 22 by a. guide loop 25. The rocking loops, such as 21 are usual, and the operation thereof and its effect upon the bar 24 are well known. Tt is, therefore, thought to be unnecessary to describe the same in this connection.

To normally open the jaws 11, I have provided a spring 26, the central and equallycurved median portion whereof is wrapped about a pin 27 extended upward on the plate 15, as best seen in Figs. 1 and 2 of the drawings. lVhen the operator, seeking to release the grip on the jaws 11 on the crown B, presses outward the free end of the loop 21, the spring 23 permitting, the spring 2G operates responsively to open the jaws and spread apart the grips 10, the bars 22 and 24 sliding each upon the other until arrested by the abutment of the loops 21 and 25. To rotate the screw 19 when disposed in a substantially vertical position, and when in service, T provide an elongated stem 28. The stem 28 is pivotally supported by a small standard 29, said standard being mounted upon the pin 13, as seen best in Fig. 1 of the drawings.

The stem 28 is connected with the screw 19 by means of a universal joint formed by a llO threads formed to receive the same, to eX- tend or retract said screw, forcing the end I 18 upon the root A to lift the jaws 11 of the l To provide f for packing or storing of the implement herein described, means are provided for forceps relative to the tooth.

this handling of same by the removal 'of the stem 28 and the screw 19 from service position. For this purpose, the stem 19 is provided with reduced portions 34. The standj ard 29 is forked at the upper end, the sides being drawn together to form a contracted passage 35 (see Fig. 5 of the drawings). The passage 35 is too contracted to permit the passage of the body of the stem, but is sufficiently wide to permit the passage of the reduced portion 34. Then it is sought to dismantle the implement, 4the stem 28 is manipulated to unscrew the screw 19. lhen said screw is liberated, the stem is then shifted lengthwise until the reduced portion 34 registers with t-lie yoke end fof the standard 29. The stem 28 is then lifted upward through the passage 35, out of engagement with said standard.

Vhen constructed and arranged as above described, andas shown in the accompanying drawings, the operation 'of the device is as follows: The crown B having been preliminarily bored to form a perforation through which the reduced end 18 of the screw 19 may extend, the remover is placed in the mouth of the patient, and the aws 11 of the forceps are disposed about the tooth and crown. The grips 10 are then contracted until the jaws 11 of the forceps close upon the crown B. Care is taken that the jaws 11 grip the crown only. Pressure is applied to force the seri-ations 12 into the metal forming the crown, to obtain a grip thereon. As the grips 10 are moved together, the loop 21 slips on the bar 24. The spring 23 maintains the gripping position of the loop 21, as seen in Fig. 3 of the drawings, to take up any slack, and to hold the jaws 11 in the fully closed and tightened position to which they are moved by the hand of the operator. The jaws 11 being thus adjusted, the operator grasps the nut 33, and manipulates the stem 28 to turn the screw 19 downward through the extension 20 against the top of the root A. The root A becomes thereafter a foundation against which the reduced end presses. The threads of the screw 19 operate thereafter to lift the plate 15 and jaws 11 of the forceps. The crown B is lifted with the jaws 11 until removed from the root A. It will be noted that the grip of the jaws 11 is at no time varied vrelative to the crown B, and that as a result of this, the crown is not crushed when lifted free of the root A.

Claims.

1. A dental crown remover, comprising a gripping tool having closable jaws; a spring to normally hold said jaws in open position; a screw operatively mounted between said' jaws; means for manipulating said screw to move the same relative to said jaws; and means for locking said jaws in closed position. A

2. A dentalcrown remover, comprising a gripping tool having closable jaws; a screw operatively mounted between said jaws; an elongated operating stem disposed substantially perpendicular to saidV screw to project froin the mouth of a person; and a universal joint for said stem and said screw.

3. A dental crown remover, comprising a gripping tool having closable jaws; a screw operatively mounted between said jaws; an elongated operating stem disposed substantially perpendicular to said screw to project f'rom the mouth of a person; a universal joint for said stem and said screw; and a bearing for said stem, mounted upon said tool to raise said stem for disposition thereof at an angle to said jaws.

4. A dental crown remover, comprising a gripping tool having closable jaws; a screw operatively mounted between said jaws; an elongated operating stem disposed substantially perpendicular to said screw to project from the mouth of a person; a universal joint for said stem and said screw; and a bearing for said stein, mounted upon said tool to raise said stem for disposition thereof at an angle to said jaws, said bearing embodying a yoke into which said stem may be inserted.

5. A dental crown remover, comprising a gripping tool having closable jaws; a screw operatively mounted between said jaws; an elongated stem operatively connected with said screw and disposed to project from the mouth of a person, said stem having a reduced section; and an upraised bearing for said stem, embodying a yoke having a contracted entrance opening, the dimensions of said opening being less than the normal diameter of saidk stein and conforming to the diameter of said contracted section.

6. A dental crown remover, comprising a gripping tool having closable jaws and closable hand gripping members therefor; an automatic lock for holding said hand gripping members in closed position; a screw j operatively mounted between said jaws; and

means substantially co-eXtensive with said hand gripping members for manipulating said screw. Y

7. In a dental crown remover, comprising a gripping tool having closable jaws and olosable hand gripping members therefor; an automatic look for holding said hand gripping members in closed position; a screw operatively mounted between said jaws; means substantially eo-extensive with said hand gripping members for manipulating said screw; and a universal' joint operatively connecting said screw and operating means therefor.

8. A dental crown remover7 Comprising a gripping tool having olosable jaws and closable hand gripping members; a plurality of parallel juxtaposed bars, one extending from each of said hand `ripping members; a rooking loop operative y mounted on one of said bars to oramp the other of said bars when moved in one direction only; and a spring mounted on said bars to normally rook said loop into cramping position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

RICHARDSON H. TAYLOR.

Witnesses:

JOHN R. CLARK, JAMES OLDLAND.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

